Medium 5.3Published Mar 20, 2026

CVE-2026-33066SiYuan has Stored XSS to RCE via Unsanitized Bazaar README Rendering

Updated under an hour ago (Oct 27, 2026, 11:00 AM ET)

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It affects siyuan-note siyuan and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for siyuan-note siyuan

Exploited in the last 30 days

SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the backend renderREADME function uses lute.New() without calling SetSanitize(true), allowing raw HTML embedded in Markdown to pass through unmodified. The frontend then assigns the rendered HTML to innerHTML without any additional sanitization. A malicious package author can embed arbitrary JavaScript in their README that executes when a user clicks to view the package details. Because SiYuan's Electron configuration enables nodeIntegration: true with contextIsolation: false, this XSS escalates directly to full Remote Code Execution. The issue was patched in version 3.6.1.

CVSS: 5.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

siyuan-note siyuan siyuan_note:siyuan (from the name)	before 3.6.1	CNA record
b3log siyuan b3log:siyuan	before 3.6.1	NVD

References

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4663-4mpg-879v	x-refsource-confirm, exploit, mitigation, vendor-advisory
https://github.com/siyuan-note/siyuan/commit/b382f50e1880ed996364509de5a10a72d7409428	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.